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Petrus Olai is a latinization of Peder (Per) Olsson (Olsen) or Olofsson, used by a number of early modern Scandinavian authors:
- Petrus Olai (Peder Olsen), ca. 1490–ca. 1570, Danish Franciscan friar and historiographer
- Petrus Olai Dalekarlus (1601–1680), Swedish pastor and politician